By the early 20th century, the Goulds lost control over virtually all these railroads largely due to mismanagement by Jay's son, George Jay Gould.[3] Despite losing the source of much of their wealth, subsequent generations of the family continued to be involved in business, politics and philanthropy.
^ abcdMorris, Charles M. (2005). The Tycoons:How Andrew Carnegie, John D. Rockefeller, Jay Gould and J.P. Morgan Invented the American Supereconomy. New York City, NY: Henry Holt and Company. pp. 144–145. ISBN978-0-8050-8134-3.
^Treese, Lorett (2006). Railroads of New Jersey: Fragments of the Past in the Garden State Landscape. Stackpole Books. p. 152. ISBN978-0-8117-3260-4.
^ abFarnsworth, Robert S. (2017). The Grand Western Railroad Game: The History of the Chicago, Rock Island, & Pacific Railroads. Volume I: The Empire Years: 1850 Up to the Great War. Dorrance Publishing. p. 362. ISBN978-1-4809-2707-0.
^White, Henry Kirke (1895). History of the Union Pacific Railway. University of Chicago Press. p. 52.
^ abcdSteinmetz, Greg (2023). American Rascal: How Jay Gould Built Wall Street's Biggest Fortune. Simon & Schuster. p. 183. ISBN978-1-9821-0741-3.
^Grant, H. Roger (2019) [2004]. "Follow the Flag": A History of the Wabash Railroad Company. Northern Illinois University Press. p. 52. ISBN978-1-5017-4777-9.
^McQuaid, Kevin L. "Manekin Starts Work on Big P.G. Co. Mixed-Use Project." Baltimore Business Journal. November 15, 1991.
Douglas, George H. (2007). "Geography and Railroad Development". In Middleton, William D.; Smerk, George M.; Diehl, Roberta L. (eds.). Encyclopedia of North American Railroads. Bloomington, Indiana: Indiana University Press. p. 494. ISBN978-0-253-34916-3.
Drury, George H. (2007). "Colorado & Southern Railway". In Middleton, William D.; Smerk, George M.; Diehl, Roberta L. (eds.). Encyclopedia of North American Railroads. Bloomington, Indiana: Indiana University Press. p. 305. ISBN978-0-253-34916-3.
Hutto, Richard Jay (2006). Their Gilded Cage: The Jekyll Island Club Members. Henchard Press Ltd. ISBN978-0-9770912-2-5.